init

.gitignore

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+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/

.travis.yml

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+language: go
+
+go:
+  - 1.x
+
+before_install:
+  - export GO111MODULE=on
+  - go get github.com/mattn/goveralls
+  - if ! go get github.com/golang/tools/cmd/cover; then go get golang.org/x/tools/cmd/cover; fi
+
+script:
+  - go test -c -covermode=count -coverpkg=github.com/skythen/bertlv
+  - ./bertlv.test -test.coverprofile coverage.cov
+  - $HOME/gopath/bin/goveralls -service=travis-ci -coverprofile=coverage.cov

LICENSE

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+MIT License
+
+Copyright (c) 2021 skythen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# BER-TLV
+
+[![Build Status](https://travis-ci.org/skythen/bertlv.svg?branch=master)](https://travis-ci.org/skythen/bertlv)
+[![Coverage Status](https://coveralls.io/repos/github/bertlv/badge.svg)](https://coveralls.io/github/skythen/bertlv)
+[![GoDoc](https://godoc.org/github.com/skythen/bertlv?status.svg)](http://godoc.org/github.com/skythen/bertlv)
+[![Go Report Card](https://goreportcard.com/badge/github.com/skythen/bertlv)](https://goreportcard.com/report/github.com/skythen/bertlv)
+
+Package bertlv implements parsing and building of BER-TLV structures.
+
+Please note that this is not a complete implementation of the X.690 standard as it is agnostic about classes (Universal, Application, Context-specific, Private) and therefore does not check for correct encoding of tags/values.
+
+`go get github.com/skythen/bertlv`
+
+## Parse
+
+You can parse BER-TLV encoded data from bytes:
+
+```go
+b := []byte{0x71, 0x10, 0xB0, 0x0E, 0x0F, 0x05, 0x01, 0x02, 0x03, 0x04, 0x05, 0x0E, 0x05, 0x05, 0x04, 0x03, 0x02, 0x01}
+bertlvs, err := Parse(b)
+```
+### Constructed objects
+You can check if a BerTLV is constructed and get first or all children or filter child objects by tag:
+```go
+if bertlvs[0].Tag.IsConstructed() {
+    child := bertlvs[0].FirstChild(NewOneByteTag(0x0F))
+}
+```
+
+## Create
+You can create single BER-TLVs with NewBerTLV:
+```go
+val := []byte{0xB0, 0x0E, 0x0F, 0x05, 0x01, 0x02, 0x03, 0x04, 0x05, 0x0E, 0x05, 0x05, 0x04, 0x03, 0x02, 0x01}
+bertlv, err := NewBerTLV(NewOneByteTag(0x71), val)
+```
+
+If you want to create complex constructed objects you use the Builder:
+```go
+builder := Builder{}
+nestedBuilder := Builder{}
+anotherNestedBuilder := Builder{}
+
+berTlvs, err := builder.AddBytes(NewOneByteTag(0x71), 			     // first level, constructed object
+    nestedBuilder.AddBytes(NewOneByteTag(0xB0), 		             // second level, constructed object
+        anotherNestedBuilder.
+            AddBytes(NewOneByteTag(0x0F), []byte{0x01, 0x02, 0x03, 0x04, 0x05}). // third level primitive object
+            AddBytes(NewOneByteTag(0x0E), []byte{0x05, 0x04, 0x03, 0x02, 0x01}). // third level primitive object
+        Bytes()).
+    Bytes()).
+BuildBerTLVs()
+```
+
+You can also use
+- builder.AddEmpty() to add objects without value
+- builder.AddByte() to add objects with a value that consists of a single byte
+- builder.AddRaw() to add raw bytes